package cn.circle.mobile.util;

import java.io.InputStream;
import java.io.Writer;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;

import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;

import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.core.util.QuickWriter;
import com.thoughtworks.xstream.io.HierarchicalStreamWriter;
import com.thoughtworks.xstream.io.xml.PrettyPrintWriter;
import com.thoughtworks.xstream.io.xml.XppDriver;

import cn.circle.mobile.pagemodel.response.Article;
import cn.circle.mobile.pagemodel.response.MusicMessage;
import cn.circle.mobile.pagemodel.response.NewsMessage;
import cn.circle.mobile.pagemodel.response.TextMessage; 
/** 
 * 消息工具类 
 *  
 * @date 
 */ 
public class MessageUtil {
	 /** 
     * 返回消息类型：文本 
     */ 
    public static final String RESP_MESSAGE_TYPE_TEXT = "text"; 
 
    /** 
     * 返回消息类型：音乐 
     */ 
    public static final String RESP_MESSAGE_TYPE_MUSIC = "music"; 
 
    /** 
     * 返回消息类型：图文 
     */ 
    public static final String RESP_MESSAGE_TYPE_NEWS = "news"; 
    /** 
     * 返回消息类型：视频
     */ 
    public static final String RESP_MESSAGE_VIDEO= "video"; 
    /** 
     * 请求消息类型：文本 
     */ 
    public static final String REQ_MESSAGE_TYPE_TEXT = "text"; 
 
    /** 
     * 请求消息类型：图片 
     */ 
    public static final String REQ_MESSAGE_TYPE_IMAGE = "image"; 
 
    /** 
     * 请求消息类型：链接 
     */ 
    public static final String REQ_MESSAGE_TYPE_LINK = "link"; 
 
    /** 
     * 请求消息类型：地理位置 
     */ 
    public static final String REQ_MESSAGE_TYPE_LOCATION = "location"; 
 
    /** 
     * 请求消息类型：音频 
     */ 
    public static final String REQ_MESSAGE_TYPE_VOICE = "voice"; 
 
    /** 
     * 请求消息类型：推送 
     */ 
    public static final String REQ_MESSAGE_TYPE_EVENT = "event"; 
 
    /** 
     * 事件类型：subscribe(订阅) 
     */ 
    public static final String EVENT_TYPE_SUBSCRIBE = "subscribe"; 
 
    /** 
     * 事件类型：unsubscribe(取消订阅) 
     */ 
    public static final String EVENT_TYPE_UNSUBSCRIBE = "unsubscribe"; 
 
    /** 
     * 事件类型：CLICK(自定义菜单点击事件) 
     */ 
    public static final String EVENT_TYPE_CLICK = "CLICK"; 
    
    /** 
     * 事件类型：VIEW(自定义菜单点击调转事件) 
     */ 
    public static final String EVENT_TYPE_VIEW = "VIEW"; 
    
    /** 
     * 事件类型：LOCATION(上报地理位置) 
     */ 
    public static final String EVENT_TYPE_LOCATION = "LOCATION"; 
 
    /** 
     * 解析微信发来的请求（XML） 
     *  
     * @param request 
     * @return 
     * @throws Exception 
     */ 
    @SuppressWarnings("unchecked") 
    public static Map<String, String> parseXml(HttpServletRequest request) throws Exception { 
        // 将解析结果存储在HashMap中 
        Map<String, String> map = new HashMap<String, String>(); 
 
        // 从request中取得输入流 
        InputStream inputStream = request.getInputStream(); 
        // 读取输入流 
        SAXReader reader = new SAXReader(); 
        Document document = reader.read(inputStream); 
        // 得到xml根元素 
        Element root = document.getRootElement(); 
        // 得到根元素的所有子节点 
        List<Element> elementList = root.elements(); 
 
        // 遍历所有子节点 
        for (Element e : elementList) 
            map.put(e.getName(), e.getText()); 
 
        // 释放资源 
        inputStream.close(); 
        inputStream = null; 
 
        return map; 
    } 
 
    /** 
     * 文本消息对象转换成xml 
     *  
     * @param textMessage 文本消息对象 
     * @return xml 
     */ 
    public static String textMessageToXml(TextMessage textMessage) { 
        xstream.alias("xml", textMessage.getClass()); 
        return xstream.toXML(textMessage); 
    } 
 
    /** 
     * 音乐消息对象转换成xml 
     *  
     * @param musicMessage 音乐消息对象 
     * @return xml 
     */ 
    public static String musicMessageToXml(MusicMessage musicMessage) { 
        xstream.alias("xml", musicMessage.getClass()); 
        return xstream.toXML(musicMessage); 
    } 
 
    /** 
     * 图文消息对象转换成xml 
     *  
     * @param newsMessage 图文消息对象 
     * @return xml 
     */ 
    public static String newsMessageToXml(NewsMessage newsMessage) { 
        xstream.alias("xml", newsMessage.getClass()); 
        xstream.alias("item", new Article().getClass()); 
        return xstream.toXML(newsMessage); 
    } 
    
    /** 
     * 视频消息对象转换成xml 
     *  
     * @param videoMessage 视频消息对象 
     * @return xml 
     */ 
//    public static String videoMessageToXml(VideoMessage videoMessage) { 
//        xstream.alias("xml", videoMessage.getClass()); 
//        return xstream.toXML(videoMessage); 
//    } 
 
    /** 
     * 扩展xstream，使其支持CDATA块 
     *  
     * @date 2013-05-19 
     */ 
    private static XStream xstream = new XStream(new XppDriver() { 
        public HierarchicalStreamWriter createWriter(Writer out) { 
            return new PrettyPrintWriter(out) { 
                // 对所有xml节点的转换都增加CDATA标记 
                boolean cdata = true; 
 
                @SuppressWarnings("unchecked") 
                public void startNode(String name, Class clazz) { 
                    super.startNode(name, clazz); 
                } 
 
                protected void writeText(QuickWriter writer, String text) { 
                    if (cdata) { 
                        writer.write("<![CDATA["); 
                        writer.write(text); 
                        writer.write("]]>"); 
                    } else { 
                        writer.write(text); 
                    } 
                } 
            }; 
        } 
    }); 
}
